It's not that strange for two people who work together to fall in love, but it does seem to happen an awful lot in Hollywood (although to be fair, most of us don't spend our days rolling around half-naked with our co-workers). So even though it might be easy to fall in love at work, it isn't as easy for a couple to stay in love once they're spending every waking moment together -- and the latest celebrity couple who will put my theory to the test is Anna Paquin and Stephen Moyer (better known as Sookie and Vampire Bill) from HBO's True Blood. The two fell in love (and got engaged) while working on the vampire soap, and now they're heading back to work together in the thriller, Open House.

According to IMDB, the story will center on a couple whose marriage is on the rocks, and are trying to offload their palatial home during a weekend 'open house'. But, things start to get a little weird when it turns out one of the potential buyers never left. The film was written by Paquin's brother Andrew (who will be making his directorial debut), and the cast will include Tricia Helfer (BSG), Rachel Blanchard (Spread), and Brian Geraghty (The Hurt Locker) in unspecified roles while the True Blood stars will play the married couple.

Moyer and Paquin aren't the first real-life couple who like to work together, and over the years plenty of Hollywood power couples have tried and failed to translate that relationship onto the big screen. After the jump: some other famous real-life couples on the big screen...